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Lithium-niobate-based surface acoustic wave oscillator directly integrated with CMOS sustaining amplifier

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3 Author(s)
Tanaka, S. ; Member; Department of Nanomechanics, Tohoku University, Sendai, Japan ; Park, K. ; Esashi, M.

In this study, a LiNbO3-based SAW resonator was directly integrated with a CMOS sustaining amplifier using new wafer-bonding-based integration technology. The developed integration technology has overcome the large thermal expansion mismatch between LiNbO3 (14 to 15 ppm/K along the a-axis) and Si (2.6 ppm/K) by temporary wafer supporting and low-temperature Au–Au bonding. Two kinds of bonding, UV polymer bonding for temporary wafer supporting and Au–Au bonding following plasma surface activation, are key process technologies. A 500-MHz one-chip SAW oscillator was prototyped and evaluated. A low phase noise of –122 dBc/ Hz at 10 kHz offset and –160 dBc/Hz at 500 kHz offset was achieved.

Published in:

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:59 ,  Issue: 8 )

Date of Publication:

August 2012

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